Yep but he is fishing in an empty pond. The only communication Trump would have had with the GSA would be in regards to the old DC post office that Trump renovated.
This is a double nothing burger with cheese.
But I am glade to see Trump's people are holding Mueller accountable.
No, this is not simply emails to/from GSA, the whole Trump transition team had email accounts hosted on servers maintained by GAS. That does not necessarily mean there is something problematic, but these are tens of thousands of emails sent and received by at least a dozen Trump transition officials.